novice problems with bind named and sendmail

[Jose.Dr.G at gmail.com]

your telling the sendmail that this 'localhost' is the machine's name.
Try getting rid of this entry...

localhost.local.net0.        IN CNAME   chub.local.net0.

in the zone file, you have to always end the fqdn names w/ a '.'
unless you use $ORIGIN which adds whatever suffix you use to any names
e.g

$ORIGIN local.net0.

Try browsing other people's zone files to see examples of this in
action